Switch to metadata inference for all graphs

* graph metadata is deleted
* datasource metadata is deleted
* files and scripts used to generate such metadata is kept

Change-Id: I6a51e1e5894db38bb609f364d26d176b6d61b176
Add data to UI-Daily

Add Category and Nearby button to UI-Daily graph.

See also: I408625adc5722584209e0c299f8ffcb2f28032be

Change-Id: If757a4de32f73985c1075e34ee26689118580a6c